Glossary A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 1 | 3 | 4 | 5 Definitions by InvestorWords.com   What is...? put An option contract that gives the holder the right to sell a certain quantity of an underlying security to the writer of the option, at a specified price (strike price) up to a specified date (expiration date); here also called put option. Also, the act of exercising a put option. opposite of call. see also sell, assignment, exercise, class of options, covered put, uncovered put, spread, security, single option, type. Copyright ©2009 by InvestorGuide.com. All Rights Reserved.